import java.util.Scanner;

public class Test001 {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int a,b,c ;
		a = scanner.nextInt();
		b = scanner.nextInt();
		c = scanner.nextInt();
		if(!((a+b>c) && (a+c>b) && (b+c>a))) {
			System.out.println("not a tringle");
			return;
		}
		if(a<b) {
			int t=a;
			a=b;
			b=t;
		}
		if(a<c) {
			int t=a;
			a=c;
			c=t;
		}
		if(a*a==b*b+c*c) {
			System.out.println("yes");
		}else {
			System.out.println("no");
		}
	}

}
